Charles e



(NOMOW- 0. E. CARPENTER.

ELECTRIC SOLDERING IRON.

No. 436,119. Patented Sept. 9, 1890.

HNI

' vented certain new and ;useful Improvements 5o checks by layers of electrical insulating ma- .such an iron electrically heated and of such .may be readily replaced by new parts.

UNITED STATES PATENT OFFICE.

CHARLES E. CARPENTER, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO THE CARPENTER-NEVENS ELECTROJIEATIN G COMPANY, OF SAME PLACE.

ELECTRIC SOLDERING-IRON.

SPECIFICATION forming 3m of Letters P Application are June 21, 1890.

To all whom it may concern:

Be it known that I, CHARLES E. CARPEN- TER, a citizen of the United States, and a resident of-tlie city of Minneapolis, in the county of Hennepin and State of Minnesota, have inin Electric Soldering-Irons, of which the following is a specification.

This invention relates to improveme'nts'in that class of soldering-irons commonly known as hatchet-irons, principally employed in the making of cans and analogous uses. These irons have the general shape of an ordinary rectly into the fire.

The prime object of this invention is to have construction that the wearing parts thereof Another object is to have the electro-heating elements of the iron so disposed that the electrical conductor or resistance may at all times be maintained under sufficient pressure to promote the desirable results from its use to the maximum degree.

These objects are attained by the devices illustrated in the accompanying drawings, in which v Figure 1 represents a side elevation of a soldering-iron embodying my invention, with parts broken away to more clearly disclose the internal structure thereof; Fig. 2, a top plan view thereof, shownpartly in horizontal section on the line 2 2 of Fig. 1; and Fig. 3, a transverse vertical section on the line 3 3 of Fig. 1.

Similar letters of reference indicate the same parts in the several figures of the drawings.

Referring by letter to the accompanying drawings, A indicates the main body of the iron, preferably composed of a block of copper of suitable dimensions and configuration, on each side of which is located a check or compressing plate B, preferably composed of iron, between each of which and the body is interposed a resistance or electrical conductor G, separated from both the body and the Serial No.3ti6fl00- (Remodel) terial D E, preferably in the form of thin sheets of asbestus paper, to one which the re sistance in the form of a fine iron wire may be suitably secured. This electrical insulation, however, should be of such character as to oppose the minimum obstruction to the passage of heat from the resistance to the body of the iron. The inner insulation D is interposed between the resistance and body of the iron solely for the purpose of preventing electrical contact therebetween and the resultant short-circuiting of the resistance and other evils which would necessarily attend such contact; but the insulation E between the'eheeks and the resistance is designed to perform the further function of preventing either the conduction or radiation of the heat evolved from the resistance, and should therefore be of such thickness and character as to accomplish this desirable end.

The cheeks aresecured in position upon the body by means of screws F working freely through one of them and the body and engaging screw-threaded perforations or sockets in the other cheek, thus furnishing at the same time a means for binding the cheeks and the intervening elements against the iron body under pressure, which may be varied at .will and which at all times will be sufiicient to prevent short-circniting of the resistance or electrical conductor and the resultant fusion thereof or the falling away of the same from the insulation to which it is secured or between which it is confined.

The bodyportion of the iron extends slightly below the cheeks, and is provided with a removable blade G, fitting onto the body andprovided with a groove of any suitable character fitting closely upon a ridge of corresponding form on the body A, extending from end toend thereof. This ridge-and-groove connection subserves the double purpose of providing a large surface for contact between the body and the blade and of preventing a lateral. movement of the blade with relation to the body.

The resistance employed is preferably of the reflex type, as illustrated inFig. 1,and composed of iron wires disposed upon tne card of asbestos board in any suitable manner.

For convenience in manipulating the iron I provide a cap H, secured toone and oi the body by screws I, into which cap is screwed one end of a tube J, which acts as a handle and also provides a channel for the inleading wires K K to the resistance, the tube at its op-' posite end having fastened thereon a ferrule be put. For instance, the body, which is composed of a flat block of copper or other suitable metal, has a heating-resistance lying on each side thereof and confined thereon in such manner that the heat evolved from the resistances will be confined directly to the body and from it transmitted by" conduction to the removable blade, which, being a part subjected to constant wear, may by reason of its construction be readily replaced by a new blade when worn beyond usefulness.

Having described my invention, what I claimand desire to secure byLetters Patent,

1. In an electric soldering-iron, the combination, with the body and the cheek-plates thereof, of an electrical conductor or resistance interposed between each of said plates and the body, and an insulation interposed between said resistances and the body and the plates, substantially as described.

2. In an electricsolderingeiron, the combination, with the body, the cheek-plates on each side thereof, and a removable blade attached blade provided with a longitudinal groove fitto said body, of an electrical conductor or resistance interposed between each of said plates and the body, and an insulation inter- 5 posed between each of said resistances and the body and plates, substantially as described.

3. In an electric soldering-iron, the combination, with the body, the cheek-plates on each side thereof, and means for bindingsaid plates to the body under pressure, of an electrical conductor or resistance interposed between each of said plates and the body, and an insulation interposed between each of said resistances and the body and plates, substantially 5 5 as described.

4. Inan electric soldering-iron, the combination, with the body, the cheek-plates on each side thereof, means for securing said plates to the body under pressure, and a removable blade attached to the body, of an--electrical conductor or resistance interposed between each of said plates and the body, and an in sulation interposed between said resistances and the body and plates, substantially as described. I I

5. In an electric soldering-iron, the combination, with the body, the cheek-plates, screws securing said plates to the body, a removable 7o ting upon. a ridge on the body, and a screw passing through the bodyand securing the blade in position, of an electrical conductor or resistance interposed between each of said' plates and the body, and an insulation interposed between said resistances and the body and plates,,substantially as described.

In testimony whereof I aflix my signature in presence of two witnesses.

CHARLES E. CARPENTER. 

